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提出一种由形状记忆合金(shape memory alloy,简称SMA)螺旋弹簧和平面滑动支座组成的SMA弹簧-摩擦支座(SMA Spring-Friction Bearing,简称SFB)。根据SFB的构造和工作原理,推导了描述其力学性能的理论模型。为考察SFB在双层球面网壳结构隔震控制中的适用性和减振效果,将SFB设置在网壳屋盖与下部结构之间形成柱顶隔震机制。通过有限元分析软件SAP 2000建立含有下部结构的网壳结构隔震体系数值计算模型,针对这一网壳隔震体系的地震响应进行数值模拟。计算结果表明,SFB能够有效降低网壳结构的地震响应,并具有优良的支座位移控制性能与复位能力。
A SMA Spring-Friction Bearing (SFB) consisting of a shape memory alloy (SMA) spiral spring and a planar sliding support is proposed. According to the structure and working principle of SFB, a theoretical model describing its mechanical properties is deduced. In order to investigate the applicability and damping effect of SFB in the isolation control of double-layer spherical reticulated domes, the SFB was set up between the reticulated shell roof and the substructure to form a column-top isolation mechanism. The finite element analysis software SAP2000 was used to establish the numerical calculation model of the isolation system with the reticulated shell structure containing the substructure, and the numerical simulation of the seismic response of the reticulated shell system was carried out. The calculation results show that SFB can effectively reduce the seismic response of the reticulated shell structure and has excellent displacement control performance and resetting ability.